题目内容
已知α?(-
,0),sinα=-
,则cos(π-α)=______.
| π |
| 2 |
| 3 |
| 5 |
α?(-
,0),sinα=-
,所以cosα=
cos(π-α)=-cosα=-
故答案为:-
| π |
| 2 |
| 3 |
| 5 |
| 4 |
| 5 |
cos(π-α)=-cosα=-
| 4 |
| 5 |
故答案为:-
| 4 |
| 5 |
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题目内容
| π |
| 2 |
| 3 |
| 5 |
| π |
| 2 |
| 3 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |